This is because your Lord would not destroy the (populations of) towns for their wrong-doing (i.e. associating others in worship along with Allah) while their people were unaware (so the Messengers were sent).
यह जान लो कि तुम्हारा रब ज़ुल्म करके बस्तियों को विनष्ट करनेवाला न था, जबकि उनके निवासी बेसुध रहे हों